Mundorf AMT 2340 Air Motion Transformer.
Part of the Mundorf Holographic Sound Device series.
Dimensions: 130mm x 102mm x 20mm - Metal Face Plate
Frequency Range 2200Hz to 23000Hz
3.9 ohm
90 dB (1W/1m)
100 Watt (crossover over 12dB)
Tweeter is open to the back. If placed in the same air volume with a cone driver, it must be chambered. Can offer di-pole results when used free air. Please see the pdf file for complete specs and curves.